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Itoigawa, Japan climate
Cfa Humid subtropical
Itoigawa has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 87°F, while the coldest is January averaging around 34°F at night. Around 114 inches of precipitation falls each year, peaking in December (16.0 inches) and easing off in May (4.7 inches).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Itoigawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 45 | 52 | 61 | 70 | 76 | 83 | 87 | 80 | 70 | 60 | 50 |
| Avg temp (°F) | 38 | 39 | 44 | 53 | 62 | 69 | 77 | 80 | 73 | 63 | 53 | 44 |
| Avg low (°F) | 34 | 33 | 37 | 46 | 55 | 64 | 72 | 74 | 67 | 57 | 47 | 38 |
| Precipitation (in) | 14.0 | 8.9 | 8.1 | 5.3 | 4.7 | 6.6 | 9.4 | 8.8 | 9.9 | 9.2 | 13.4 | 16.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 45 | 45 | 52 | 61 | 70 | 76 |
| Avg temp (°F) | 38 | 39 | 44 | 53 | 62 | 69 |
| Avg low (°F) | 34 | 33 | 37 | 46 | 55 | 64 |
| Precipitation (in) | 14.0 | 8.9 | 8.1 | 5.3 | 4.7 | 6.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 87 | 80 | 70 | 60 | 50 |
| Avg temp (°F) | 77 | 80 | 73 | 63 | 53 | 44 |
| Avg low (°F) | 72 | 74 | 67 | 57 | 47 | 38 |
| Precipitation (in) | 9.4 | 8.8 | 9.9 | 9.2 | 13.4 | 16.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 91 | 85 | 76 | 68 | 68 | 75 | 75 | 63 | 71 | 69 | 76 | 87 |
| Relative humidity (%) | 90 | 87 | 82 | 78 | 77 | 82 | 84 | 82 | 83 | 82 | 84 | 88 |
| Wind speed (mph) | 8.5 | 8.4 | 7.1 | 5.5 | 4.1 | 3.4 | 3.3 | 3.6 | 4.2 | 4.9 | 6.0 | 7.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 91 | 85 | 76 | 68 | 68 | 75 |
| Relative humidity (%) | 90 | 87 | 82 | 78 | 77 | 82 |
| Wind speed (mph) | 8.5 | 8.4 | 7.1 | 5.5 | 4.1 | 3.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 63 | 71 | 69 | 76 | 87 |
| Relative humidity (%) | 84 | 82 | 83 | 82 | 84 | 88 |
| Wind speed (mph) | 3.3 | 3.6 | 4.2 | 4.9 | 6.0 | 7.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Itoigawa, about 2 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.